stepper motor drivers, or complete motors

[tom25]

For an easy to build machine, I had a set of long Nema 23 stepper motor with DM542 drivers to use. After trying it once, it turns out that very little speed can be achieved with it.

So I am looking for three drivers with slightly more quality or that are suitable for a higher voltage (60/70 volts).
Or a set of Nema 23/24 motors with those built-in drivers.

If anyone has anything lying around, I'd love to hear it!